Update CSS, run prettier

static/style.css

@@ -3,7 +3,7 @@
  * A simple, clean, flexible Hugo theme
  * https://github.com/nanxiaobei/hugo-paper
  * Designed by MR.LEE (https://mrlee.me/)
- * Updated in 2019.8.23
+ * Updated in 2019.9.15
  */
 
 /* Variables
@@ -15,7 +15,6 @@
   --main-width: 640px;
   --header-height: 60px;
   --footer-height: 60px;
-
   --radius: 8px;
 
   --primary: rgba(0, 0, 0, 0.88);
@@ -39,8 +38,8 @@ html {
 body {
   margin: 0;
   color: var(--primary);
-  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
-    Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell,
+    'Open Sans', 'Helvetica Neue', sans-serif;
   font-size: 18px;
   line-height: 1.8;
   word-break: break-word;
@@ -101,8 +100,8 @@ textarea {
   -webkit-appearance: none;
 }
 button,
-input[type="button"],
-input[type="submit"] {
+input[type='button'],
+input[type='submit'] {
   cursor: pointer;
 }
 input,
@@ -157,16 +156,18 @@ img {
 /* Body
 -------------------------------------------------- */
 .list {
+  position: relative;
   background: linear-gradient(135deg, #e2e2e2, #f8f8f8, #ddd);
 }
-.list::before {
-  content: "";
+.list-bg {
   position: absolute;
   z-index: -1;
-  left: 0;
-  right: 0;
   top: 0;
   bottom: 0;
+  left: 0;
+  right: 0;
+  background: rgba(0, 0, 0, 0.24);
+  opacity: 0;
 }
 /* Main
 -------------------------------------------------- */
@@ -326,8 +327,7 @@ img {
 }
 .post-content del {
   text-decoration: none;
-  background: linear-gradient(to right, var(--primary) 100%, transparent 0) 0
-    50% / 1px 1px repeat-x;
+  background: linear-gradient(to right, var(--primary) 100%, transparent 0) 0 50% / 1px 1px repeat-x;
 }
 .post-content p,
 .post-content ul,
@@ -423,7 +423,7 @@ img {
   margin-left: 4px;
   margin-right: 4px;
   padding: 4px 6px;
-  font-family: Menlo, Monaco, "Courier New", Courier, monospace;
+  font-family: Menlo, Monaco, 'Courier New', Courier, monospace;
   font-size: 0.78em;
   line-height: 1.5;
   background: var(--code-bg);